Nanoid Generator Online — URL-Safe Compact IDs
Generate Nanoid-style IDs with CSPRNG in your browser. Pick a size preset and alphabet (URL-safe, alphanumeric, or numeric).
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Nanoid generator — developer notes
Compact IDs via unbiased sampling over a fixed alphabet. URL-safe alphabet by default (64 chars); UI size presets only.
How generation works
Pick size (8/12/16/21/32), alphabet, and count, then Generate. Rejection sampling + crypto.getRandomValues — never Math.random.
Options
Size (presets)
Longer IDs reduce collisions. The UI offers presets only (no free-form field); the lib clamps 2–64 defensively.
Alphabet
url = A–Z a–z 0–9 _- (Nanoid default). alphanumeric = without _-. numeric = digits only.
Count (1–20)
Multiple IDs for fixtures, capped at 20.
Examples
Default URL-safe
Settings
Output
Short numeric
Settings
Output
Related utilities
Need UUIDs? See the UUID generator. For time-sortable IDs, the ULID generator.
Nanoid generator FAQ
Compact IDs
Can I type a custom size?
Not in v1 — only presets 8, 12, 16, 21, and 32 to avoid bad configs.
Custom alphabet?
Out of scope. Three documented presets only.
Is data uploaded?
No — local generation only.
Why not the npm nanoid package?
A small implementation aligned with the password-generator CSPRNG pattern, with no npm dependency.
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